Support domain-search in dhclient(8)

The "domain-search" option (option 119) allows a DHCP server to publish
a list of implicit domain suffixes used during name lookup. This option
is described in RFC 3397.

For instance, if the domain-search option says:
    ".example.org .example.com"
and one wants to resolve "foobar", the resolver will try:
    1. "foobar.example.org"
    2. "foobar.example.com"

The file /etc/resolv.conf is updated with a "search" directive if the
DHCP server provides "domain-search".

A regression test suite is included in this patch under
tools/regression/sbin/dhclient.

PR:		bin/151940
Sponsored by	Yakaz (http://www.yakaz.com)

1 files changed, 4 insertions, 0 deletions

diff --git a/sbin/dhclient/dhcp-options.5 b/sbin/dhclient/dhcp-options.5
index 3735606..1405839 100644
--- a/sbin/dhclient/dhcp-options.5
+++ b/sbin/dhclient/dhcp-options.5
@@ -265,6 +265,10 @@ character set.
 .It Ic option domain-name Ar string ;
 This option specifies the domain name that the client should use when
 resolving hostnames via the Domain Name System.
+.It Ic option domain-search Ar string ;
+This option specifies a list of domain names that the client should use
+when resolving hostnames via the Domain Name System. This option is
+defined in RFC 3397.
 .It Ic option swap-server Ar ip-address ;
 This specifies the IP address of the client's swap server.
 .It Ic option root-path Ar string ;